Oncologist-approved cancer information from the American Society of Clinical Oncology
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Leukemia - Eosinophilic

This section has been reviewed and approved by the Cancer.Net Editorial Board, 5/2013

ON THIS PAGE: You will find some basic information about this disease and the parts of the body it may affect. This is the first page of Cancer.Net’s Guide to Eosinophilic Leukemia. To see other pages, use the colored boxes on the right side of your screen. Think of those boxes as a roadmap to this full guide. Or, click “Next” at the bottom of each page.

About leukemia

Leukemia is a cancer of the blood cells. Leukemia begins when normal blood cells change and grow uncontrollably. Blood cells are produced in the bone marrow, the spongy tissue inside the larger bones in the body. There are different types of blood cells, including red blood cells that carry oxygen throughout the body, white cells that fight infection, and platelets that help the blood to clot. Abnormalities (changes) in the bone marrow cells can cause too many or too few of certain blood cells. There are four main types of leukemia in adults:

About eosinophilic leukemia

Eosinophilia is a condition that develops when the bone marrow makes too many eosinophils, a type of white blood cell. People can have many eosinophils without having leukemia. For example, sometimes the body makes too many eosinophils because of an allergy or an infection with a parasite. This type of eosinophilia is called secondary eosinophilia and is much more common than eosinophilic leukemia.

Chronic eosinophilic leukemia is a subtype of clonal eosinophilia, meaning it is caused by a new genetic mutation (change) in the blood cells. It is sometimes called hypereosinophilic syndrome (HES). This disease is classified as a myeloproliferative disorder (myelo- means bone marrow and proliferative means too much).

This section focuses on chronic eosinophilic leukemia. Acute eosinophilic leukemia is very rare and is treated similarly to acute myeloid leukemia (AML)

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